211231232030440 has 32 divisors (see below), whose sum is σ = 500284496916000. Its totient is φ = 80045519505984.

The previous prime is 211231232030411. The next prime is 211231232030477. The reversal of 211231232030440 is 44030232132112.

It is a junction number, because it is equal to n+sod(n) for n = 211231232030399 and 211231232030408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138967915050 + ... + 138967916569.

It is an arithmetic number, because the mean of its divisors is an integer number (15633890528625).

Almost surely, 2^{211231232030440} is an apocalyptic number.

211231232030440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211231232030440 is an abundant number, since it is smaller than the sum of its proper divisors (289053264885560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211231232030440 is a wasteful number, since it uses less digits than its factorization.

211231232030440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277935831649 (or 277935831645 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 211231232030440 its reverse (44030232132112), we get a palindrome (255261464162552).

The spelling of 211231232030440 in words is "two hundred eleven trillion, two hundred thirty-one billion, two hundred thirty-two million, thirty thousand, four hundred forty".